Develop Reference

JavaScript use original getter/setter in defineProperty

I would like to create a TypeScript decorator that can extend the logic of a property's getter/setter. I have tried to copy the original property under a symbol and call that when I redefine the property. The problem is it turns into an infinite loop.
//Find the latest version of 'attribute' getter setter in the prototype chain
let obj = _object;
while(obj && !(Object.getOwnPropertyDescriptor(obj, 'attribute'))){
obj = Object.getPrototypeOf(obj);
}
//Copy original 'attribute' logic under a symbol
const attributeDesc = Object.getOwnPropertyDescriptor(obj, 'attribute');
let id=Symbol('__attribute');
Object.defineProperty(obj, id, attributeDesc);
//Redefine 'attribute' logic
Object.defineProperty(_object, 'attribute', {
get: () => {
//call original
const attribute = obj[id]; //It crashes the page (probably infinite loop)
//extend original logic
attribute['extend'] = 'property';
return attribute;
},
enumerable: false,
configurable: true
});
If you could explain me why it ends up this way that would help me out. I thought the new getter function reference nothing to do with the original. Please suggest me a solution to achive this in JavaScript.
Thank you for your time and answers!

I don't quite see the error. In the repro you provided, it's logical that there is one: the getter for attribute property is calling itself on the line var attributes = obj[id], so there is an infinite loop. However if you edit your code to be like the snippet you provided in the question:
class A {
get attribute() {
return { a: 1 }
}
}
var _object = new A()
let obj = _object
while (obj && !Object.getOwnPropertyDescriptor(obj, 'attribute')) {
obj = Object.getPrototypeOf(obj)
}
const attributeDesc = Object.getOwnPropertyDescriptor(obj, 'attribute')
let id = Symbol('__attribute')
Object.defineProperty(obj, id, attributeDesc)
Object.defineProperty(obj, 'attribute', {
get: function () {
var attributes = obj[id]
attributes['extend'] = 'property'
return attributes
},
enumerable: false,
configurable: true,
})
console.log('result:', obj.attribute)
There is no error and it works as expected.
You don't really need the symbol though, you could do something like
function extendAttributes(_object) {
let obj = _object
while (obj && !Object.hasOwnProperty(obj, 'attributes')) {
obj = Object.getPrototypeOf(obj)
}
if(!obj) return;
const oldContainer = {}
const attributesDescriptor = Object.getOwnPropertyDescriptor(obj, 'attributes')
Object.defineProperty(oldContainer, 'attributes', attributesDescriptor)
Object.defineProperty(obj, 'attributes', {
get() {
const attribute = oldContainer.attributes;
//extend original logic
attribute['extend'] = 'property';
return attribute;
}
})
}
class A {
get attributes() { return {a: 1} }
}
const obj = new A()
extendAttributes(obj)
console.log(obj.attributes)
Which also works like expected

Is there any way to intercept methods triggered with [] in js? [duplicate]

I can't seem to find the way to overload the [] operator in javascript. Anyone out there know?
I was thinking on the lines of ...
MyClass.operator.lookup(index)
{
return myArray[index];
}
or am I not looking at the right things.

You can do this with ES6 Proxy (available in all modern browsers)
var handler = {
get: function(target, name) {
return "Hello, " + name;
}
};
var proxy = new Proxy({}, handler);
console.log(proxy.world); // output: Hello, world
console.log(proxy[123]); // output: Hello, 123
Check details on MDN.

You can't overload operators in JavaScript.
It was proposed for ECMAScript 4 but rejected.
I don't think you'll see it anytime soon.

The simple answer is that JavaScript allows access to children of an Object via the square brackets.
So you could define your class:
MyClass = function(){
// Set some defaults that belong to the class via dot syntax or array syntax.
this.some_property = 'my value is a string';
this['another_property'] = 'i am also a string';
this[0] = 1;
};
You will then be able to access the members on any instances of your class with either syntax.
foo = new MyClass();
foo.some_property; // Returns 'my value is a string'
foo['some_property']; // Returns 'my value is a string'
foo.another_property; // Returns 'i am also a string'
foo['another_property']; // Also returns 'i am also a string'
foo.0; // Syntax Error
foo[0]; // Returns 1
foo['0']; // Returns 1

Use a proxy. It was mentioned elsewhere in the answers but I think that this is a better example:
var handler = {
get: function(target, name) {
if (name in target) {
return target[name];
}
if (name == 'length') {
return Infinity;
}
return name * name;
}
};
var p = new Proxy({}, handler);
p[4]; //returns 16, which is the square of 4.

We can proxy get | set methods directly. Inspired by this.
class Foo {
constructor(v) {
this.data = v
return new Proxy(this, {
get: (obj, key) => {
if (typeof(key) === 'string' && (Number.isInteger(Number(key)))) // key is an index
return obj.data[key]
else
return obj[key]
},
set: (obj, key, value) => {
if (typeof(key) === 'string' && (Number.isInteger(Number(key)))) // key is an index
return obj.data[key] = value
else
return obj[key] = value
}
})
}
}
var foo = new Foo([])
foo.data = [0, 0, 0]
foo[0] = 1
console.log(foo[0]) // 1
console.log(foo.data) // [1, 0, 0]

As brackets operator is actually property access operator, you can hook on it with getters and setters. For IE you will have to use Object.defineProperty() instead. Example:
var obj = {
get attr() { alert("Getter called!"); return 1; },
set attr(value) { alert("Setter called!"); return value; }
};
obj.attr = 123;
The same for IE8+:
Object.defineProperty("attr", {
get: function() { alert("Getter called!"); return 1; },
set: function(value) { alert("Setter called!"); return value; }
});
For IE5-7 there's onpropertychange event only, which works for DOM elements, but not for other objects.
The drawback of the method is you can only hook on requests to predefined set of properties, not on arbitrary property without any predefined name.

one sneaky way to do this is by extending the language itself.
step 1
define a custom indexing convention, let's call it, "[]".
var MyClass = function MyClass(n) {
this.myArray = Array.from(Array(n).keys()).map(a => 0);
};
Object.defineProperty(MyClass.prototype, "[]", {
value: function(index) {
return this.myArray[index];
}
});
...
var foo = new MyClass(1024);
console.log(foo["[]"](0));
step 2
define a new eval implementation. (don't do this this way, but it's a proof of concept).
var MyClass = function MyClass(length, defaultValue) {
this.myArray = Array.from(Array(length).keys()).map(a => defaultValue);
};
Object.defineProperty(MyClass.prototype, "[]", {
value: function(index) {
return this.myArray[index];
}
});
var foo = new MyClass(1024, 1337);
console.log(foo["[]"](0));
var mini_eval = function(program) {
var esprima = require("esprima");
var tokens = esprima.tokenize(program);
if (tokens.length == 4) {
var types = tokens.map(a => a.type);
var values = tokens.map(a => a.value);
if (types.join(';').match(/Identifier;Punctuator;[^;]+;Punctuator/)) {
if (values[1] == '[' && values[3] == ']') {
var target = eval(values[0]);
var i = eval(values[2]);
// higher priority than []
if (target.hasOwnProperty('[]')) {
return target['[]'](i);
} else {
return target[i];
}
return eval(values[0])();
} else {
return undefined;
}
} else {
return undefined;
}
} else {
return undefined;
}
};
mini_eval("foo[33]");
the above won't work for more complex indexes but it can be with stronger parsing.
alternative:
instead of resorting to creating your own superset language, you can instead compile your notation to the existing language, then eval it. This reduces the parsing overhead to native after the first time you use it.
var compile = function(program) {
var esprima = require("esprima");
var tokens = esprima.tokenize(program);
if (tokens.length == 4) {
var types = tokens.map(a => a.type);
var values = tokens.map(a => a.value);
if (types.join(';').match(/Identifier;Punctuator;[^;]+;Punctuator/)) {
if (values[1] == '[' && values[3] == ']') {
var target = values[0];
var i = values[2];
// higher priority than []
return `
(${target}['[]'])
? ${target}['[]'](${i})
: ${target}[${i}]`
} else {
return 'undefined';
}
} else {
return 'undefined';
}
} else {
return 'undefined';
}
};
var result = compile("foo[0]");
console.log(result);
console.log(eval(result));

You need to use Proxy as explained, but it can ultimately be integrated into a class constructor
return new Proxy(this, {
set: function( target, name, value ) {
...}};
with 'this'. Then the set and get (also deleteProperty) functions will fire. Although you get a Proxy object which seems different it for the most part works to ask the compare ( target.constructor === MyClass ) it's class type etc. [even though it's a function where target.constructor.name is the class name in text (just noting an example of things that work slightly different.)]

So you're hoping to do something like
var whatever = MyClassInstance[4];
?
If so, simple answer is that Javascript does not currently support operator overloading.

Have a look at Symbol.iterator. You can implement a user-defined ##iterator method to make any object iterable.
The well-known Symbol.iterator symbol specifies the default iterator for an object. Used by for...of.
Example:
class MyClass {
constructor () {
this._array = [data]
}
*[Symbol.iterator] () {
for (let i=0, n=this._array.length; i<n; i++) {
yield this._array[i]
}
}
}
const c = new MyClass()
for (const element of [...c]) {
// do something with element
}

Javascript prototype set object or other prototype directly [duplicate]

Is it possible to subclass and inherit from javascript Arrays?
I'd like to have my own custom Array object that has all the features of an Array, but contains additional properties. I'd use myobj instanceof CustomArray to perform specific operations if the instance is my CustomArray.
After attempting to subclass and running into some problems, I found this Dean Edwards article that indicates doing this with Array objects doesn't work right. It turns out Internet Explorer doesn't handle it properly. But I'm finding other issues as well (only tested in Chrome so far).
Here's some sample code:
/**
* Inherit the prototype methods from one constructor into another
* Borrowed from Google Closure Library
*/
function inherits(childCtor, parentCtor) {
function tempCtor() {};
tempCtor.prototype = parentCtor.prototype;
childCtor.superClass_ = parentCtor.prototype;
childCtor.prototype = new tempCtor();
childCtor.prototype.constructor = childCtor;
},
// Custom class that extends Array class
function CustomArray() {
Array.apply(this, arguments);
}
inherits(CustomArray,Array);
array = new Array(1,2,3);
custom = new CustomArray(1,2,3);
Entering the following in Chrome's console gives this output:
> custom
[]
> array
[1, 2, 3]
> custom.toString()
TypeError: Array.prototype.toString is not generic
> array.toString()
"1,2,3"
> custom.slice(1)
[]
> array.slice(1)
[2, 3]
> custom.push(1)
1
> custom.toString()
TypeError: Array.prototype.toString is not generic
> custom
[1]
Obviously, the objects don't behave the same. Should I give up on this approach, or is there some way to accomplish my goal of myobj instanceof CustomArray?

Juriy Zaytsev (#kangax) just today released a really good article on the subject.
He explores various alternatives like the Dean Edwards iframe borrowing technique, direct object extension, prototype extension and the usage of ECMAScript 5 accessor properties.
At the end there is no perfect implementation, each one has its own benefits and drawbacks.
Definitely a really good read:
How ECMAScript 5 still does not allow to subclass an array

ES6
class SubArray extends Array {
last() {
return this[this.length - 1];
}
}
var sub = new SubArray(1, 2, 3);
sub // [1, 2, 3]
sub instanceof SubArray; // true
sub instanceof Array; // true
Original Answer: (Not recommended, may cause performance issues)
Copy-pasting from article mentioned in the accepted answer for more visibility
Using __proto__
function SubArray() {
var arr = [ ];
arr.push.apply(arr, arguments);
arr.__proto__ = SubArray.prototype;
return arr;
}
SubArray.prototype = new Array;
Now you can add your methods to SubArray
SubArray.prototype.last = function() {
return this[this.length - 1];
};
Initialize like normal Arrays
var sub = new SubArray(1, 2, 3);
Behaves like normal Arrays
sub instanceof SubArray; // true
sub instanceof Array; // true

I've tried to do this sort of thing before; generally, it just doesn't happen. You can probably fake it, though, by applying Array.prototype methods internally. This CustomArray class, though only tested in Chrome, implements both the standard push and custom method last. (Somehow this methodology never actually occurred to me at the time xD)
function CustomArray() {
this.push = function () {
Array.prototype.push.apply(this, arguments);
}
this.last = function () {
return this[this.length - 1];
}
this.push.apply(this, arguments); // implement "new CustomArray(1,2,3)"
}
a = new CustomArray(1,2,3);
alert(a.last()); // 3
a.push(4);
alert(a.last()); // 4
Any Array method you intended to pull into your custom implementation would have to be implemented manually, though you could probably just be clever and use loops, since what happens inside our custom push is pretty generic.

Checkout this. It works as it should in all browsers which support '__proto__'.
var getPrototypeOf = Object.getPrototypeOf || function(o){
return o.__proto__;
};
var setPrototypeOf = Object.setPrototypeOf || function(o, p){
o.__proto__ = p;
return o;
};
var CustomArray = function CustomArray() {
var array;
var isNew = this instanceof CustomArray;
var proto = isNew ? getPrototypeOf(this) : CustomArray.prototype;
switch ( arguments.length ) {
case 0: array = []; break;
case 1: array = isNew ? new Array(arguments[0]) : Array(arguments[0]); break;
case 2: array = [arguments[0], arguments[1]]; break;
case 3: array = [arguments[0], arguments[1], arguments[2]]; break;
default: array = new (Array.bind.apply(Array, [null].concat([].slice.call(arguments))));
}
return setPrototypeOf(array, proto);
};
CustomArray.prototype = Object.create(Array.prototype, { constructor: { value: CustomArray } });
CustomArray.prototype.append = function(var_args) {
var_args = this.concat.apply([], arguments);
this.push.apply(this, var_args);
return this;
};
CustomArray.prototype.prepend = function(var_args) {
var_args = this.concat.apply([], arguments);
this.unshift.apply(this, var_args);
return this;
};
["concat", "reverse", "slice", "splice", "sort", "filter", "map"].forEach(function(name) {
var _Array_func = this[name];
CustomArray.prototype[name] = function() {
var result = _Array_func.apply(this, arguments);
return setPrototypeOf(result, getPrototypeOf(this));
}
}, Array.prototype);
var array = new CustomArray(1, 2, 3);
console.log(array.length, array[2]);//3, 3
array.length = 2;
console.log(array.length, array[2]);//2, undefined
array[9] = 'qwe';
console.log(array.length, array[9]);//10, 'qwe'
console.log(array+"", array instanceof Array, array instanceof CustomArray);//'1,2,,,,,,,,qwe', true, true
array.append(4);
console.log(array.join(""), array.length);//'12qwe4', 11

Here's a full example that should work on ie9 and greater. For <=ie8 you'd have to implement alternatives to Array.from, Array.isArray, etc. This example:
Puts the Array subclass in its own closure (or Namespace) to avoid conflicts and namespace pollution.
Inherits all prototypes and properties from the native Array class.
Shows how to define additional properties and prototype methods.
If you can use ES6, you should use the class SubArray extends Array method laggingreflex posted.
Here is the essentials to subclass and inherit from Arrays. Below this excerpt is the full example.
///Collections functions as a namespace.
///_NativeArray to prevent naming conflicts. All references to Array in this closure are to the Array function declared inside.
var Collections = (function (_NativeArray) {
//__proto__ is deprecated but Object.xxxPrototypeOf isn't as widely supported. '
var setProtoOf = (Object.setPrototypeOf || function (ob, proto) { ob.__proto__ = proto; return ob; });
var getProtoOf = (Object.getPrototypeOf || function (ob) { return ob.__proto__; });
function Array() {
var arr = new (Function.prototype.bind.apply(_NativeArray, [null].concat([].slice.call(arguments))))();
setProtoOf(arr, getProtoOf(this));
return arr;
}
Array.prototype = Object.create(_NativeArray.prototype, { constructor: { value: Array } });
Array.from = _NativeArray.from;
Array.of = _NativeArray.of;
Array.isArray = _NativeArray.isArray;
return { //Methods to expose externally.
Array: Array
};
})(Array);
Full example:
///Collections functions as a namespace.
///_NativeArray to prevent naming conflicts. All references to Array in this closure are to the Array function declared inside.
var Collections = (function (_NativeArray) {
//__proto__ is deprecated but Object.xxxPrototypeOf isn't as widely supported. '
var setProtoOf = (Object.setPrototypeOf || function (ob, proto) { ob.__proto__ = proto; return ob; });
var getProtoOf = (Object.getPrototypeOf || function (ob) { return ob.__proto__; });
function Array() {
var arr = new (Function.prototype.bind.apply(_NativeArray, [null].concat([].slice.call(arguments))))();
setProtoOf(arr, getProtoOf(this));//For any prototypes defined on this subclass such as 'last'
return arr;
}
//Restores inherited prototypes of 'arr' that were wiped out by 'setProtoOf(arr, getProtoOf(this))' as well as add static functions.
Array.prototype = Object.create(_NativeArray.prototype, { constructor: { value: Array } });
Array.from = _NativeArray.from;
Array.of = _NativeArray.of;
Array.isArray = _NativeArray.isArray;
//Add some convenient properties.
Object.defineProperty(Array.prototype, "count", { get: function () { return this.length - 1; } });
Object.defineProperty(Array.prototype, "last", { get: function () { return this[this.count]; }, set: function (value) { return this[this.count] = value; } });
//Add some convenient Methods.
Array.prototype.insert = function (idx) {
this.splice.apply(this, [idx, 0].concat(Array.prototype.slice.call(arguments, 1)));
return this;
};
Array.prototype.insertArr = function (idx) {
idx = Math.min(idx, this.length);
arguments.length > 1 && this.splice.apply(this, [idx, 0].concat([].pop.call(arguments))) && this.insert.apply(this, arguments);
return this;
};
Array.prototype.removeAt = function (idx) {
var args = Array.from(arguments);
for (var i = 0; i < args.length; i++) { this.splice(+args[i], 1); }
return this;
};
Array.prototype.remove = function (items) {
var args = Array.from(arguments);
for (var i = 0; i < args.length; i++) {
var idx = this.indexOf(args[i]);
while (idx !== -1) {
this.splice(idx, 1);
idx = this.indexOf(args[i]);
}
}
return this;
};
return { //Methods to expose externally.
Array: Array
};
})(Array);
Here are some usage examples and tests.
var colarr = new Collections.Array("foo", "bar", "baz", "lorem", "ipsum", "lol", "cat");
var colfrom = Collections.Array.from(colarr.reverse().concat(["yo", "bro", "dog", "rofl", "heyyyy", "pepe"]));
var colmoded = Collections.Array.from(colfrom).insertArr(0, ["tryin", "it", "out"]).insert(0, "Just").insert(4, "seems", 2, "work.").remove('cat','baz','ipsum','lorem','bar','foo');
colmoded; //["Just", "tryin", "it", "out", "seems", 2, "work.", "lol", "yo", "bro", "dog", "rofl", "heyyyy", "pepe"]
colmoded instanceof Array; //true

ES6 minimal runnable example with custom constructor
If you also want to override the constructor, then some extra care is needed because some of the methods will need the old constructor.
Using the techniques mentioned at: How can I extend the Array class and keep its implementations we can reach:
#!/usr/bin/env node
const assert = require('assert');
class MyArray extends Array {
constructor(nodes, myint) {
super(...nodes);
this.myint = myint;
}
static get [Symbol.species]() {
return Object.assign(function (...items) {
return new MyArray(new Array(...items))
}, MyArray);
}
inc() { return this.myint + 1; }
}
const my_array = new MyArray([2, 3, 5], 9);
assert(my_array[0] === 2);
assert(my_array[1] === 3);
assert(my_array[2] === 5);
assert(my_array.myint === 9);
assert(my_array.inc() === 10);
assert(my_array.toString() === '2,3,5');
my_slice = my_array.slice(1, 2);
assert(my_slice[0] === 3);
assert(my_slice.constructor === MyArray);
Getting the index notation [] without Arrray has been asked at: Implement Array-like behavior in JavaScript without using Array
Tested in Node.js v10.15.1.

I've created a simple NPM module that solves this - inherit-array. It basically does the following:
function toArraySubClassFactory(ArraySubClass) {
ArraySubClass.prototype = Object.assign(Object.create(Array.prototype),
ArraySubClass.prototype);
return function () {
var arr = [ ];
arr.__proto__ = ArraySubClass.prototype;
ArraySubClass.apply(arr, arguments);
return arr;
};
};
After writing your own SubArray class you can make it inherit Array as follows:
var SubArrayFactory = toArraySubClassFactory(SubArray);
var mySubArrayInstance = SubArrayFactory(/*whatever SubArray constructor takes*/)

javascript object library for browser

I am currently working on creating a page that requires the Object.keys method from the Object class. The browser that this needs to run in however is the IGB of Eve online.
This browser does not support Object.keys and therefore
JavaScript error:
Uncaught TypeError: Object function Object() { [native code] } has no method 'keys'
My proposed solution of this was to find somewhere the defined Object class for javascript and reference it on my page beforehand like:
<script src="someURLtoJavascriptObjectClass"></script>
I have however not found it through my google searches.
I just realised this after having worked on the project for way too long, I only tried bits and pieces of it through the IGB but I forgot to test this method and it has become quite key to what I want to do. I would very much like this to resolve easily with a simple link. It can be solved with other methods but this would be by far the cleanest.
Can someone help me in the right direction?

You could try implementing the Polyfill in your code.
// From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys
if (!Object.keys) {
Object.keys = (function() {
'use strict';
var hasOwnProperty = Object.prototype.hasOwnProperty,
hasDontEnumBug = !({ toString: null }).propertyIsEnumerable('toString'),
dontEnums = [
'toString',
'toLocaleString',
'valueOf',
'hasOwnProperty',
'isPrototypeOf',
'propertyIsEnumerable',
'constructor'
],
dontEnumsLength = dontEnums.length;
return function(obj) {
if (typeof obj !== 'object' && (typeof obj !== 'function' || obj === null)) {
throw new TypeError('Object.keys called on non-object');
}
var result = [], prop, i;
for (prop in obj) {
if (hasOwnProperty.call(obj, prop)) {
result.push(prop);
}
}
if (hasDontEnumBug) {
for (i = 0; i < dontEnumsLength; i++) {
if (hasOwnProperty.call(obj, dontEnums[i])) {
result.push(dontEnums[i]);
}
}
}
return result;
};
}());
}

Insert an object into unknow object path

I want to insert an object into a somewhat predefined object:
var obj = {
"scripts": {
"libs":{}
},
"plugins":{}
}
//....
function addobj(path, obj){
console.log(path); // Object {libs: Object}..
path.push(obj); // TypeError: undefined is not a function
}
// Test cases:
addobj(obj["scripts"],{"test":{}});
console.log(obj);
But an error occurs: TypeError: undefined is not a function Why is this happening?
http://jsfiddle.net/Qn3Tb/

Using jQuery, you can use $.extend():
demo
$.extend(path,obj);

You can't .push onto an Object. An Object is a key-value store, therefore you need to assign a key to the object (value) you want to store on the parent object. How you go about achieving that is another question, but something like this might work:
function addobj(path, obj, key) {
path[key || "unnamed"] = obj;
}
If you wanted to add libs to scripts you would do the following:
addobj(script, libs, "libs");
However given what this addobj method actually does, my suggestion would be to drop the abstraction altogether, it's not needed.

Why not simply do
function addProp(prop, value, targetObject){
targetObject[prop] = value;
}
addProp('scripts', { test:{}}, obj);
Based on your question, you can use this to target a specific property:
var obj = {
"scripts": {
"libs":{
"labs": {
foo: 1
}
}
},
"plugins":{}
};
function setPropByString(obj, propString, value) {
if (!propString)
return obj;
var prop, props = propString.split('.');
for (var i = 0, iLen = props.length - 1; i < iLen; i++) {
prop = props[i];
var candidate = obj[prop];
if (candidate !== undefined) {
obj = candidate;
} else {
break;
}
}
obj[props[i]] = value;
}
setPropByString(obj, 'scripts.libs.labs', { something: 1 });
console.log(obj);
Note that this will overwrite the existing prop. So it's propably easier to just extend with jQuery like #A.Wolff suggest.
http://jsfiddle.net/Mn45R/

You cannot do this in the way mentioned in the question.
I believe you should create a function, like
function Node(key) {
var currentNode = this;
this.getKey = function() {
return key;
};
var children = [];
this.addNode(childKey) {
children[children.length] = new Node(childKey);
}
this.search(searchKey) {
if (searchKey === key) {
return currentNode;
}
for (var childIndex in children) {
var searchResult = children[childIndex].search(searchKey);
if (!!searchResult) {
return searchResult;
}
}
return null;
}
}
You can create your root this way:
var root = new Node();
You can add a child to the root this way:
root.addNode("scripts");
This function can be used to add some node to another node having a key
function addNodeToTree(tree, key, newKey) {
var node = tree.search(key);
if (!!node) {
node.addNode(new Node(newKey));
return true;
}
return false;
}
Finally, you can add a node like this:
addNodeToTree(root, "scripts", "test");